content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl;
  
  import hu.akarnokd.reactive4javaflow.TestHelper;
  import org.junit.Test;
  
  import java.io.IOException;
  import java.lang.invoke.*;
  import java.util.concurrent.atomic.AtomicReference;
  
  import static org.junit.Assert.*;
  
  public class ExceptionHelperTest {
  
      Throwable error;
      static final VarHandle ERROR = VH.find(MethodHandles.lookup(), ExceptionHelperTest.class, "error", Throwable.class);
  
      @Test
      public void utilityClass() {
          TestHelper.checkUtilityClass(ExceptionHelper.class);
      }
  
      @Test
      public void terminated() {
          AtomicReference<Throwable> error = new AtomicReference<>();
          assertNull(ExceptionHelper.terminate(error));
          assertFalse(ExceptionHelper.addThrowable(error, new IOException()));
      }
  
      @Test
      public void addTerminateRace() {
          Throwable ex = new IOException();
          for (int i = 0; i < 1000; i++) {
              AtomicReference<Throwable> error = new AtomicReference<>();
  
              Runnable r1 = () -> ExceptionHelper.terminate(error);
              Runnable r2 = () -> ExceptionHelper.addThrowable(error, ex);
  
              TestHelper.race(r1, r2);
  
              assertSame(ExceptionHelper.TERMINATED, error.get());
          }
      }
  
      @Test
      public void addSuccessVarHandle() {
          assertTrue(ExceptionHelper.addThrowable(this, ERROR, new IOException()));
  
          assertNotNull(error);
      }
  
      @Test
      public void terminatedVarHandle() {
          assertNull(ExceptionHelper.terminate(this, ERROR));
          assertFalse(ExceptionHelper.addThrowable(this, ERROR, new IOException()));
      }
  
      @Test
      public void addTerminateRaceVarHandle() {
          Throwable ex = new IOException();
          for (int i = 0; i < 1000; i++) {
              Runnable r1 = () -> ExceptionHelper.terminate(this, ERROR);
              Runnable r2 = () -> ExceptionHelper.addThrowable(this, ERROR, ex);
  
              TestHelper.race(r1, r2);
  
              assertSame(ExceptionHelper.TERMINATED, error);
          }
      }
  }
  